皂化二-(2-乙基己基)磷酸萃取锂的动力学研究  

Kinetics Study of Lithium Extraction by Saponified di-(2-ethylhexyl)Phosphate

作　　者：罗超 时东[1,2] 李丽娟 彭小五[1,2] 张禹泽 牛勇 程鑫雨 宋富根 LUO Chao;SHI Dong;LI Li-juan;PENG Xiao-wu;ZHANG Yu-ze;NIU Yong;CHENG Xin-yu;SONG Fu-gen(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖资源综合利用技术研究开发中心,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《盐湖研究》2023年第2期45-54,共10页Journal of Salt Lake Research

基　　金：国家自然科学基金区域创新发展联合基金项目(U21A20305);青海省基础研究计划项目(2022-ZJ-772);中国科学院青年创新促进会(2021430)。

摘　　要：采用恒界面池法研究了钠皂二-(2-乙基己基)磷酸(P204)萃取锂的动力学,考察了搅拌强度、界面面积、反应温度和反应物浓度等因素对锂萃取速率影响。通过搅拌强度、界面积和温度对萃取速率影响规律判别该萃取过程为扩散和界面化学反应共同控制,萃取过程表观活化能为19.95 kJ·mol^(-1)。基于反应物浓度对萃取速率影响,确定初始萃取速率方程为R_(Li,init)=(0.0048±0.0007)·n_(Li+)·n_(NaA),_(Li^(+))与A^(-)(P204阴离子)在界面处生成LiA的反应为萃取锂过程的决速步骤。The kinetics of lithium extraction by saponified di-(2-ethylhexyl)phosphate(P 204)was studied by Lewis cell technique.The effects of stirring speed,interface area,temperature and reactant concentration on the initial lithium extraction rate were investigated.According the influence of stirring speed,interface area and temperature on extraction rate,the lithium extraction process was controlled by diffusion and interfacial chemical reaction,and the apparent activation energy was calculated to be 19.95 kJ·mol^(-1).Based on the effect of reactant concentration on extraction rate,the initial rate equation was established as R_(Li,init)=(0.0048±0.0007)⋅n^(Li^(+))⋅n_(NaA),and the reaction between Li^(+)and A^(-)(P204 anion)to form LiA at the interface was the decisive step of the extraction process.

关 键 词：萃取动力学 锂 二-(2-乙基己基)磷酸 恒界面池 

分 类 号：TS396.5[轻工技术与工程]